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Income Taxes (Schedule of deferred income tax assets and (liabilities) (Details) - USD ($)
Jun. 30, 2024
Jun. 30, 2023
Net deferred income tax assets (liabilities):    
Inventory capitalization for income tax purposes $ 28,642 $ 43,155
Inventory reserve 145,227 120,153
Accrued employee benefit reserve 40,164 43,088
Warranty reserve 29,720 28,016
Interest expense limitation 339,509 233,416
Allowance for credit losses and other 35,918 85,351
Property and equipment, principally due to differences in depreciation 108,025 27,883
Research and development credit carryover 574,022 574,022
Deferred gain on sale lease-back 191,436 224,777
Operating loss carry forwards 5,388,117 4,719,831
Valuation allowance (6,884,228) (6,104,053)
Capitalized research and development 3,448 4,361
Total deferred income tax assets (liabilities) $ 0 $ 0